There are seven continents: North America, South America, Europe, Asia, Africa, Australia and Antarctica. The Oceania region is sometimes associated with Australia, but this group of land masses is not actually a continent.
In some parts of the world, people group the Americas together as one continent and are taught that there are six continents. Others consider Europe and Asia to be one continent called Eurasia.
A continent is a continuous mass of land. According to the continental drift theory, all the land on Earth was joined at one time in a continent called Pangea, and the movement of tectonic plates caused some land masses to drift apart, forming individual continents.
Land covers less than one-third of the Earth's surface; the rest is covered by water. The four major oceans on Earth are the Pacific Ocean, Atlantic Ocean, Indian Ocean and Arctic Ocean.